How to adjust the indication error of the universal material testing machine?

by:Sinowon     2021-07-22
How to adjust the indication error of the universal material testing machine?
According to the force value of the testing area of u200bu200bthe testing machine, clamp the standard tensile specimen of the corresponding force value on the testing machine, and let the testing machine stretch the standard tensile specimen at the speed specified in the GB/T228-2002 standard. When the standard tensile specimen is in tension, install an extensometer or stick a strain gauge on it, let the tensile testing machine continue to stretch the standard tensile specimen, and the extensometer or strain gauge will extend the extension of the standard tensile specimen Display, convert the elongation into a tensile value, and compare it with the same force point on the dial of the tensile testing machine as the standard tensile specimen, and determine the technical status and accuracy of the testing machine based on the difference of the comparison value. This method uses Hooke's law to convert the elongation of the standard tensile specimen into a force value and compare it with the dial force value of the testing machine to determine the accuracy of the testing machine. This method greatly simplifies the verification operation process, and brings great convenience and standardization to the daily verification of the original tensile state of the universal material testing machine. The verification method of the universal material testing machine is characterized in that, first, according to the force value of the tensile testing machine in the tested interval, select the standard tensile specimen, and the force value of the standard tensile specimen is 60% to 90% of the full-scale force value of the interval. To choose between, clamp the standard tensile specimen on the tensile testing machine, and let the tensile testing machine stretch the standard tensile specimen at the speed specified in the GB/T228-2002 standard, and immediately when the pointer of the tensile testing machine swings slightly Stop stretching, that is, the standard tensile test specimen is in a tensile state. At this time, install an extensometer or paste a strain gauge on the standard tensile test specimen, and let the tensile testing machine continue to test the standard tensile force at the speed specified in the GB/T228-2002 standard The sample is stretched, and the extensometer or strain gage displays the elongation of the standard tensile specimen. According to Hooke’s law, the elongation is converted to the tensile value, which is the same as the standard tensile specimen on the dial of the tensile testing machine. The force value points are compared, and the technical status and accuracy of the testing machine are determined according to the difference of the comparison value.


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